/* 首页样式 */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
    border-radius: 15px;
    margin-bottom: 3rem;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.data-categories {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.data-categories h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
    font-size: 2rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.category-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-5px);
    border-color: #667eea;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.category-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.category-card h3 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.category-card p {
    color: #666;
    margin-bottom: 1rem;
}

.frequency-info {
    background: #e3f2fd;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    display: inline-block;
}

.frequency {
    color: #1976d2;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .data-categories {
        padding: 1rem;
    }
}

/* 页脚样式 */
.site-footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-content p {
    margin: 0;
    font-size: 0.9rem;
    color: #ccc;
}

.footer-content a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-content a:hover {
    color: #667eea;
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .site-footer {
        padding: 1rem 0;
    }
    
    .footer-content {
        padding: 0 1rem;
    }
    
    .footer-content p {
        font-size: 0.85rem;
    }
}